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Title: Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites

High-performance solid electrolytes are critical for realizing all-solid-state batteries with enhance safety and cycling efficiency. However, currently available candidates (sulfides and the NASICON-typ ceramics) still suffer from drawbacks such as inflammability, high-cost and unfavorable machinability Here we present the structural manipulation approaches to improve the sodium ionic conductivity in series of affordable Na-rich antiperovskites. Experimentally, the whole solid solutions of Na 3OX (X ¼ Cl Br, I) are synthesized via a facile and timesaving route from the cheapest raw materials (Na, NaOH an NaX). The materials are nonflammable, suitable for thermoplastic processing due to low melting temperature (<300° C) without decomposing. Notably, owing to the flexibility of perovskite-type structure it's feasible to control the local structure features by means of size-mismatch substitution an unequivalent-doping for a favorable sodium ionic diffusion pathway. Enhancement of sodium ioni conductivity by 2 magnitudes is demonstrated by these chemical tuning methods. The optimized sodiu ionic conductivity in Na 2.9Sr 0.05OBr 0.6I 0.4 bulk samples reaches 1.9 10 - 3 S/cm at 200° C and even highe at elevated temperature. Here, we believe further chemical tuning efforts on Na-rich antiperovskites wil promote their performance greatly for practical all-solid state battery applications.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [2] ;  [2] ;  [2] ;  [3]
  1. Peking Univ., Beijing (China); Univ. of Nevada, Las Vegas, NV (United States)
  2. Peking Univ., Beijing (China)
  3. Univ. of Nevada, Las Vegas, NV (United States)
Publication Date:
Grant/Contract Number:
NA0001982
Type:
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 293; Journal Issue: C; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Research Org:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; antiperovskite; solid electrolyte; sodium ionic conductor; superionic
OSTI Identifier:
1332398

Wang, Yonggang, Wang, Qingfei, Liu, Zhenpu, Zhou, Zhengyang, Li, Shuai, Zhu, Jinlong, Zou, Ruqiang, Wang, Yingxia, Lin, Jianhua, and Zhao, Yusheng. Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites. United States: N. p., Web. doi:10.1016/j.jpowsour.2015.06.002.
Wang, Yonggang, Wang, Qingfei, Liu, Zhenpu, Zhou, Zhengyang, Li, Shuai, Zhu, Jinlong, Zou, Ruqiang, Wang, Yingxia, Lin, Jianhua, & Zhao, Yusheng. Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites. United States. doi:10.1016/j.jpowsour.2015.06.002.
Wang, Yonggang, Wang, Qingfei, Liu, Zhenpu, Zhou, Zhengyang, Li, Shuai, Zhu, Jinlong, Zou, Ruqiang, Wang, Yingxia, Lin, Jianhua, and Zhao, Yusheng. 2015. "Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites". United States. doi:10.1016/j.jpowsour.2015.06.002. https://www.osti.gov/servlets/purl/1332398.
@article{osti_1332398,
title = {Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites},
author = {Wang, Yonggang and Wang, Qingfei and Liu, Zhenpu and Zhou, Zhengyang and Li, Shuai and Zhu, Jinlong and Zou, Ruqiang and Wang, Yingxia and Lin, Jianhua and Zhao, Yusheng},
abstractNote = {High-performance solid electrolytes are critical for realizing all-solid-state batteries with enhance safety and cycling efficiency. However, currently available candidates (sulfides and the NASICON-typ ceramics) still suffer from drawbacks such as inflammability, high-cost and unfavorable machinability Here we present the structural manipulation approaches to improve the sodium ionic conductivity in series of affordable Na-rich antiperovskites. Experimentally, the whole solid solutions of Na3OX (X ¼ Cl Br, I) are synthesized via a facile and timesaving route from the cheapest raw materials (Na, NaOH an NaX). The materials are nonflammable, suitable for thermoplastic processing due to low melting temperature (<300° C) without decomposing. Notably, owing to the flexibility of perovskite-type structure it's feasible to control the local structure features by means of size-mismatch substitution an unequivalent-doping for a favorable sodium ionic diffusion pathway. Enhancement of sodium ioni conductivity by 2 magnitudes is demonstrated by these chemical tuning methods. The optimized sodiu ionic conductivity in Na2.9Sr0.05OBr0.6I0.4 bulk samples reaches 1.9 10- 3 S/cm at 200° C and even highe at elevated temperature. Here, we believe further chemical tuning efforts on Na-rich antiperovskites wil promote their performance greatly for practical all-solid state battery applications.},
doi = {10.1016/j.jpowsour.2015.06.002},
journal = {Journal of Power Sources},
number = C,
volume = 293,
place = {United States},
year = {2015},
month = {6}
}